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icon5.gif  KalmanFit Error [message #5376] Fri, 09 November 2007 09:59 Go to previous message
Tobias Stockmanns is currently offline  Tobias Stockmanns
Messages: 489
Registered: May 2007
first-grade participant
From: *ikp.kfa-juelich.de
Dear KalmaFitters,

when I try to fit MVD data with the Kalman task, I get the error, that (most of) my matrices are zero, which I do not understand.

Maybe one of you can help me Smile

Thanks

Tobias

MvdKalmanTask::Exec
starting track0
-I- MvdRecoHit::MvdRecoHit(MvdHit*) called.
o: 0.287864 2.69613 5.975
u: 0.707107 -0.707107 0
v: 0.707107 0.707107 0
-I- MvdRecoHit::MvdRecoHit(MvdHit*) called.
o: 2.11 1.67845 8.735
u: 0 1 0
v: 1 0 0
-I- MvdRecoHit::MvdRecoHit(MvdHit*) called.
o: 2.20361 1.60633 14.3662
u: 0.00398854 -0.999595 0.0281843
v: 0.999992 0.00399013 0
-I- MvdRecoHit::MvdRecoHit(MvdHit*) called.
o: 4.63742 3.15743 18.475
u: -0.729407 0.68408 0
v: 0.68408 0.729407 0
4 hits in track 0
starting fit
Error in <TDecompLU::DecomposeLUCrout>: matrix is singular
Error in <TDecompLU::InvertLU>: matrix is singular, 0 diag elements < tolerance of 2.2204e-16
FitterException thrown with whatString:
cannot invert covsum in Kalman Gain - det=0
in line: 265 in file: /home/stockman/fairroot/cbmsoft_old/pandaroot/genfit/Kalman.cxx
FitterException Info Output
===========================
---------------------------
Matrices Label String:
cov, HitCov, covsum1 and covsum
---------------------------
Matrices:

5x5 matrix is as follows

| 0 | 1 | 2 | 3 | 4 |
----------------------------------------------------------------------
0 | 0 0 0 0 0
1 | 0 0 0 0 0
2 | 0 0 0 0 0
3 | 0 0 0 0 0
4 | 0 0 0 0 0


3x3 matrix is as follows

| 0 | 1 | 2 |
--------------------------------------------
0 | 0.002887 0 0
1 | 0 0.002887 0
2 | 0 0 0


5x3 matrix is as follows

| 0 | 1 | 2 |
--------------------------------------------
0 | 0 0 0
1 | 0 0 0
2 | 0 0 0
3 | 0 0 0
4 | 0 0 0


3x3 matrix is as follows

| 0 | 1 | 2 |
--------------------------------------------
0 | 0.002887 0 0
1 | 0 0.002887 0
2 | 0 0 0

===========================
 
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